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Be aware this is NOT "Power over Ethernet" or PoE. There is a standard for Power over Ethernet that involves voltage choices, switching, safety features, etc. when a device connects and tries to turn on. Plugging anything but the pigtail adapter on the "unpowered" end of a cable with the pigtail adapter might cause damage to the device. It also won't power a standard Power over Ethernet device.
I believe these adapters are simply connectors and wires used to run a DC current down the unused wires on a 100 Base TX Cat5 cable. When you use this on one end of an ethernet cable, the cable is no longer standard Ethernet nor PoE ethernet.
Gigabit ethernet uses all the wires in a Cat5 Ethernet cable. If someone plugs a device with Gigabit Ethernet, such as a laptop, into your "pseudo PoE" Ethernet cable without the pigtail adapter on the other end, it might damage the laptop. Or switch, router, etc."
Standard PoE is also 48 V. You're probably OK as long as you have the pigtail adapter on both ends of the Ethernet and nobody ever accidentally or deliberately removes the pigtail on the "downstream" end and plugs directly into the Ethernet cable. Just be aware that if you use these adapters, you have what looks like a standard Ethernet plug on the other end of the cable, but it isn't.
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